@misc{indiciae6130ad0ae4fe,
  title = {On integral representations for the Neumann operator.},
  author = {D H Phong},
  year = {1979},
  doi = {10.1073/pnas.76.4.1554},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592638/},
  note = {Source identifier: 16592638}
}